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authorLinus Torvalds <torvalds@linux-foundation.org>2016-02-10 11:36:19 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2016-02-10 11:36:19 -0800
commitfb0dc5f129bc2d4763bdc237b8df0e1708c03e1e (patch)
tree4c635f1ca11535c0072d2f10282a31d16979d639 /include
parent9aece75c138d93bde79a2baeb9187a1109b4e952 (diff)
parent9a2ddda572a002633a64b1ae5f4bc49cfcbf495f (diff)
downloadlinux-fb0dc5f129bc2d4763bdc237b8df0e1708c03e1e.tar.bz2
Merge branch 'for-4.5-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup
Pull cgroup fixes from Tejun Heo: - The destruction path of cgroup objects are asynchronous and multi-staged and some of them ended up destroying parents before children leading to failures in cpu and memory controllers. Ensure that parents are always destroyed after children. - cpuset mm node migration was performed synchronously while holding threadgroup and cgroup mutexes and the recent threadgroup locking update resulted in a possible deadlock. The migration is best effort and shouldn't have been performed under those locks to begin with. Made asynchronous. - Minor documentation fix. * 'for-4.5-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup: Documentation: cgroup: Fix 'cgroup-legacy' -> 'cgroup-v1' cgroup: make sure a parent css isn't freed before its children cgroup: make sure a parent css isn't offlined before its children cpuset: make mm migration asynchronous
Diffstat (limited to 'include')
-rw-r--r--include/linux/cgroup-defs.h6
-rw-r--r--include/linux/cpuset.h6
2 files changed, 12 insertions, 0 deletions
diff --git a/include/linux/cgroup-defs.h b/include/linux/cgroup-defs.h
index 7f540f7f588d..789471dba6fb 100644
--- a/include/linux/cgroup-defs.h
+++ b/include/linux/cgroup-defs.h
@@ -127,6 +127,12 @@ struct cgroup_subsys_state {
*/
u64 serial_nr;
+ /*
+ * Incremented by online self and children. Used to guarantee that
+ * parents are not offlined before their children.
+ */
+ atomic_t online_cnt;
+
/* percpu_ref killing and RCU release */
struct rcu_head rcu_head;
struct work_struct destroy_work;
diff --git a/include/linux/cpuset.h b/include/linux/cpuset.h
index 85a868ccb493..fea160ee5803 100644
--- a/include/linux/cpuset.h
+++ b/include/linux/cpuset.h
@@ -137,6 +137,8 @@ static inline void set_mems_allowed(nodemask_t nodemask)
task_unlock(current);
}
+extern void cpuset_post_attach_flush(void);
+
#else /* !CONFIG_CPUSETS */
static inline bool cpusets_enabled(void) { return false; }
@@ -243,6 +245,10 @@ static inline bool read_mems_allowed_retry(unsigned int seq)
return false;
}
+static inline void cpuset_post_attach_flush(void)
+{
+}
+
#endif /* !CONFIG_CPUSETS */
#endif /* _LINUX_CPUSET_H */